Four words. Snappy-Low-Pass-Gates!
-- pigrabbit

Thanks for the input! I looked that up and it sounds fascinating. Apparently this is a good one? https://pittsburghmodular.com/lifeforms-dynamic-impulse-filter

Any other thoughts? Does this sound like a good mix of functions to start 1) applying the envelope of one sound to another source, and 2) filtering the resulting audio following the original envelope?

Thanks everyone!